Radio-frequency identification (RFID) communication system known as auto-id has experienced tremendous growth worldwide, considering as a flexible mechanism for identification of objects. Degradation of data transmission due to external interference and interference of RFID system itself (tags and reader collision) is one of the most important factors to restrict the development of the RFID system and has a direct bearing on the performance of the whole system. In order to eliminate the tag collision problem in an RFID system variety of different anti-collision algorithms have been proposed by many researchers for the successful adoption of RFID on a massive scale. Synthesizing much anti-collision algorithm and conducting in-depth analysis, we propose a new combined primary digital transmission technique based on time division (TD) and gold code to efficiently suppress tag-to-tag interference.